History of Wigan   (Help with ancient and recent history.)

"Does anyone have any positive info here?
Long ago when I was a youngster my dad (who originally lived just off the bottom end of Wigan Lane) told me of a pub at the bottom end of Coppull Lane..."

JR,
I have no idea how old your dad is or would be? But many decades ago, the bottom end of Coppull Lane had no buildings and there weren't any signs of buildings having been there.
But! There were buildings (houses, farms, out-buildings) at the bottom end of Coppull Lane and to the sides of the River Douglas once upon a time; I have seen old photographs showing this area and those buildings.
I cannot say when all of those buildings were demolished, but I am quite sure that it was long before my time and probably around 100 years ago.
Now, if your father was born around the time of WW1, then it is highly possible that he was correct in what he told you.

(The Green Man? - I will say something about this pub after this post).

Possibly, there could have been an old pub in that area (at the end of Coppull Lane) as many pubs were small and tucked between houses or any where which seemed appropriate in those days - some pubs only being a small house with one room allocated as a place to buy and drink a beer or two.

One thing which I can say is, when I was a kid, there were some remains of buildings not too far from the bottom end of Coppull Lane. Between Coppull Lane and the bridge (Haigh Plantations) which went over the River Douglas there was an area which we knew as the Hermitage and this is where these building remains could be seen. I was told that a farm had once been there and relatives of one of my friends had lived there.
By the way, one of my friends lived on Coppull Lane.
Regarding the remains, there were some stone flags, low remains of walls and many house bricks scattered around. These remains were mostly hidden by trees and bushes.